JSMarkOp

Obsolete since JSAPI 29This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

JSMarkOp is the type of the JSClass.mark callback in SpiderMonkey 1.7 and earlier. In SpiderMonkey 1.8, JSMarkOp will be deprecated. All new code using SpiderMonkey 1.8 or later should use a JSTraceOp instead to ensure that the tracing APIs work properly.